M4435 Narrow-Band Scanner GUI doesn't toggle on child probe

[Knotty]

Hi,

V1.1.2 on OSX 10.11.5

Though I was being clever (famous last words) with a ship that carried multiple probes to a planet's system, with a probe deployed in orbit around each moon.  
This worked with the M700 Survey scanner, with the probe consisting of this, a Z1-k battery, a couple of OX-4L Solar panels and RC-001S Remote Guidance Unit.

However, changing the M700 for a M4435, and although the scanner can be activated when the child probe is detached from the main ship, the GUI toggle only works when it's attached.  I've tried switching to the child RC-001S using control from here before detaching, but once detached only the M4435 still attached to the main ship still toggle.

By design or "undocumented feature"? :-) 
Thanks